/*
===========================================================================
Copyright (C) 1999-2005 Id Software, Inc.
Copyright (C) 2000-2006 Tim Angus

This file is part of Tremulous.

Tremulous is free software; you can redistribute it
and/or modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of the License,
or (at your option) any later version.

Tremulous is distributed in the hope that it will be
useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with Tremulous; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
===========================================================================
*/

// bg_lib.c -- standard C library replacement routines used by code
// compiled for the virtual machine


#include "../qcommon/q_shared.h"

/*-
 * Copyright (c) 1992, 1993
 *  The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *  This product includes software developed by the University of
 *  California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include "bg_lib.h"

#if defined(LIBC_SCCS) && !defined(lint)
#if 0
static char sccsid[] = "@(#)qsort.c 8.1 (Berkeley) 6/4/93";
#endif
static const char rcsid[] =
  "$Id: bg_lib.c 965 2007-08-09 13:54:12Z msk $";
#endif /* LIBC_SCCS and not lint */

// bk001127 - needed for DLL's
#if !defined( Q3_VM )
typedef int    cmp_t(const void *, const void *);
#endif

static char* med3(char *, char *, char *, cmp_t *);
static void  swapfunc(char *, char *, int, int);

#ifndef min
#define min(a, b) (a) < (b) ? a : b
#endif

/*
 * Qsort routine from Bentley & McIlroy's "Engineering a Sort Function".
 */
#define swapcode(TYPE, parmi, parmj, n) {     \
  long i = (n) / sizeof (TYPE);       \
  register TYPE *pi = (TYPE *) (parmi);     \
  register TYPE *pj = (TYPE *) (parmj);     \
  do {            \
    register TYPE t = *pi;    \
    *pi++ = *pj;        \
    *pj++ = t;        \
        } while (--i > 0);        \
}

#define SWAPINIT(a, es) swaptype = ((char *)a - (char *)0) % sizeof(long) || \
  es % sizeof(long) ? 2 : es == sizeof(long)? 0 : 1;

static void
swapfunc(a, b, n, swaptype)
  char *a, *b;
  int n, swaptype;
{
  if(swaptype <= 1)
    swapcode(long, a, b, n)
  else
    swapcode(char, a, b, n)
}

#define swap(a, b)          \
  if (swaptype == 0) {        \
    long t = *(long *)(a);      \
    *(long *)(a) = *(long *)(b);    \
    *(long *)(b) = t;     \
  } else            \
    swapfunc(a, b, es, swaptype)

#define vecswap(a, b, n)  if ((n) > 0) swapfunc(a, b, n, swaptype)

static char *
med3(a, b, c, cmp)
  char *a, *b, *c;
  cmp_t *cmp;
{
  return cmp(a, b) < 0 ?
         (cmp(b, c) < 0 ? b : (cmp(a, c) < 0 ? c : a ))
              :(cmp(b, c) > 0 ? b : (cmp(a, c) < 0 ? a : c ));
}

void
qsort(a, n, es, cmp)
  void *a;
  size_t n, es;
  cmp_t *cmp;
{
  char *pa, *pb, *pc, *pd, *pl, *pm, *pn;
  int d, r, swaptype, swap_cnt;

loop: SWAPINIT(a, es);
  swap_cnt = 0;
  if (n < 7) {
    for (pm = (char *)a + es; pm < (char *)a + n * es; pm += es)
      for (pl = pm; pl > (char *)a && cmp(pl - es, pl) > 0;
           pl -= es)
        swap(pl, pl - es);
    return;
  }
  pm = (char *)a + (n / 2) * es;
  if (n > 7) {
    pl = a;
    pn = (char *)a + (n - 1) * es;
    if (n > 40) {
      d = (n / 8) * es;
      pl = med3(pl, pl + d, pl + 2 * d, cmp);
      pm = med3(pm - d, pm, pm + d, cmp);
      pn = med3(pn - 2 * d, pn - d, pn, cmp);
    }
    pm = med3(pl, pm, pn, cmp);
  }
  swap(a, pm);
  pa = pb = (char *)a + es;

  pc = pd = (char *)a + (n - 1) * es;
  for (;;) {
    while (pb <= pc && (r = cmp(pb, a)) <= 0) {
      if (r == 0) {
        swap_cnt = 1;
        swap(pa, pb);
        pa += es;
      }
      pb += es;
    }
    while (pb <= pc && (r = cmp(pc, a)) >= 0) {
      if (r == 0) {
        swap_cnt = 1;
        swap(pc, pd);
        pd -= es;
      }
      pc -= es;
    }
    if (pb > pc)
      break;
    swap(pb, pc);
    swap_cnt = 1;
    pb += es;
    pc -= es;
  }
  if (swap_cnt == 0) {  /* Switch to insertion sort */
    for (pm = (char *)a + es; pm < (char *)a + n * es; pm += es)
      for (pl = pm; pl > (char *)a && cmp(pl - es, pl) > 0;
           pl -= es)
        swap(pl, pl - es);
    return;
  }

  pn = (char *)a + n * es;
  r = min(pa - (char *)a, pb - pa);
  vecswap(a, pb - r, r);
  r = min(pd - pc, pn - pd - es);
  vecswap(pb, pn - r, r);
  if ((r = pb - pa) > es)
    qsort(a, r / es, es, cmp);
  if ((r = pd - pc) > es) {
    /* Iterate rather than recurse to save stack space */
    a = pn - r;
    n = r / es;
    goto loop;
  }
/*    qsort(pn - r, r / es, es, cmp);*/
}

//==================================================================================


// this file is excluded from release builds because of intrinsics

// bk001211 - gcc errors on compiling strcpy:  parse error before `__extension__'
#if defined ( Q3_VM )

size_t strlen( const char *string )
{
  const char  *s;

  s = string;
  while( *s )
    s++;

  return s - string;
}


char *strcat( char *strDestination, const char *strSource )
{
  char  *s;

  s = strDestination;
  while( *s )
    s++;

  while( *strSource )
    *s++ = *strSource++;

  *s = 0;
  return strDestination;
}

char *strcpy( char *strDestination, const char *strSource )
{
  char *s;

  s = strDestination;

  while( *strSource )
    *s++ = *strSource++;

  *s = 0;
  return strDestination;
}


int strcmp( const char *string1, const char *string2 )
{
  while( *string1 == *string2 && *string1 && *string2 )
  {
    string1++;
    string2++;
  }

  return *string1 - *string2;
}

//TA:
char *strrchr( const char *string, int c )
{
  int   i, length = strlen( string );
  char  *p;

  for( i = length - 1; i >= 0; i-- )
  {
    p = (char *)&string[ i ];

    if( *p == c )
      return (char *)p;
  }

  return (char *)0;
}

char *strchr( const char *string, int c )
{
  while( *string )
  {
    if( *string == c )
      return ( char * )string;

    string++;
  }
  return (char *)0;
}

char *strstr( const char *string, const char *strCharSet )
{
  while( *string )
  {
    int   i;

    for( i = 0; strCharSet[ i ]; i++ )
    {
      if( string[ i ] != strCharSet[ i ] )
        break;
    }

    if( !strCharSet[ i ] )
      return (char *)string;

    string++;
  }
  return (char *)0;
}

#endif // bk001211

#if defined ( Q3_VM )

int tolower( int c )
{
  if( c >= 'A' && c <= 'Z' )
    c += 'a' - 'A';

  return c;
}


int toupper( int c )
{
  if( c >= 'a' && c <= 'z' )
    c += 'A' - 'a';

  return c;
}

#endif

void *memmove( void *dest, const void *src, size_t count )
{
  int   i;

  if( dest > src )
  {
    for( i = count - 1; i >= 0; i-- )
      ( (char *)dest )[ i ] = ( (char *)src )[ i ];
  }
  else
  {
    for( i = 0; i < count; i++ )
      ( (char *)dest )[ i ] = ( (char *)src )[ i ];
  }

  return dest;
}


#if 0

double floor( double x ) {
  return (int)(x + 0x40000000) - 0x40000000;
}

void *memset( void *dest, int c, size_t count ) {
  while ( count-- ) {
    ((char *)dest)[count] = c;
  }
  return dest;
}

void *memcpy( void *dest, const void *src, size_t count ) {
  while ( count-- ) {
    ((char *)dest)[count] = ((char *)src)[count];
  }
  return dest;
}

char *strncpy( char *strDest, const char *strSource, size_t count ) {
  char  *s;

  s = strDest;
  while ( *strSource && count ) {
    *s++ = *strSource++;
    count--;
  }
  while ( count-- ) {
    *s++ = 0;
  }
  return strDest;
}

double sqrt( double x ) {
  float y;
  float delta;
  float maxError;

  if ( x <= 0 ) {
    return 0;
  }

  // initial guess
  y = x / 2;

  // refine
  maxError = x * 0.001;

  do {
    delta = ( y * y ) - x;
    y -= delta / ( 2 * y );
  } while ( delta > maxError || delta < -maxError );

  return y;
}


float sintable[1024] = {
0.000000,0.001534,0.003068,0.004602,0.006136,0.007670,0.009204,0.010738,
0.012272,0.013805,0.015339,0.016873,0.018407,0.019940,0.021474,0.023008,
0.024541,0.026075,0.027608,0.029142,0.030675,0.032208,0.033741,0.035274,
0.036807,0.038340,0.039873,0.041406,0.042938,0.044471,0.046003,0.047535,
0.049068,0.050600,0.052132,0.053664,0.055195,0.056727,0.058258,0.059790,
0.061321,0.062852,0.064383,0.065913,0.067444,0.068974,0.070505,0.072035,
0.073565,0.075094,0.076624,0.078153,0.079682,0.081211,0.082740,0.084269,
0.085797,0.087326,0.088854,0.090381,0.091909,0.093436,0.094963,0.096490,
0.098017,0.099544,0.101070,0.102596,0.104122,0.105647,0.107172,0.108697,
0.110222,0.111747,0.113271,0.114795,0.116319,0.117842,0.119365,0.120888,
0.122411,0.123933,0.125455,0.126977,0.128498,0.130019,0.131540,0.133061,
0.134581,0.136101,0.137620,0.139139,0.140658,0.142177,0.143695,0.145213,
0.146730,0.148248,0.149765,0.151281,0.152797,0.154313,0.155828,0.157343,
0.158858,0.160372,0.161886,0.163400,0.164913,0.166426,0.167938,0.169450,
0.170962,0.172473,0.173984,0.175494,0.177004,0.178514,0.180023,0.181532,
0.183040,0.184548,0.186055,0.187562,0.189069,0.190575,0.192080,0.193586,
0.195090,0.196595,0.198098,0.199602,0.201105,0.202607,0.204109,0.205610,
0.207111,0.208612,0.210112,0.211611,0.213110,0.214609,0.216107,0.217604,
0.219101,0.220598,0.222094,0.223589,0.225084,0.226578,0.228072,0.229565,
0.231058,0.232550,0.234042,0.235533,0.237024,0.238514,0.240003,0.241492,
0.242980,0.244468,0.245955,0.247442,0.248928,0.250413,0.251898,0.253382,
0.254866,0.256349,0.257831,0.259313,0.260794,0.262275,0.263755,0.265234,
0.266713,0.268191,0.269668,0.271145,0.272621,0.274097,0.275572,0.277046,
0.278520,0.279993,0.281465,0.282937,0.284408,0.285878,0.287347,0.288816,
0.290285,0.291752,0.293219,0.294685,0.296151,0.297616,0.299080,0.300543,
0.302006,0.303468,0.304929,0.306390,0.307850,0.309309,0.310767,0.312225,
0.313682,0.315138,0.316593,0.318048,0.319502,0.320955,0.322408,0.323859,
0.325310,0.326760,0.328210,0.329658,0.331106,0.332553,0.334000,0.335445,
0.336890,0.338334,0.339777,0.341219,0.342661,0.344101,0.345541,0.346980,
0.348419,0.349856,0.351293,0.352729,0.354164,0.355598,0.357031,0.358463,
0.359895,0.361326,0.362756,0.364185,0.365613,0.367040,0.368467,0.369892,
0.371317,0.372741,0.374164,0.375586,0.377007,0.378428,0.379847,0.381266,
0.382683,0.384100,0.385516,0.386931,0.388345,0.389758,0.391170,0.392582,
0.393992,0.395401,0.396810,0.398218,0.399624,0.401030,0.402435,0.403838,
0.405241,0.406643,0.408044,0.409444,0.410843,0.412241,0.413638,0.415034,
0.416430,0.417824,0.419217,0.420609,0.422000,0.423390,0.424780,0.426168,
0.427555,0.428941,0.430326,0.431711,0.433094,0.434476,0.435857,0.437237,
0.438616,0.439994,0.441371,0.442747,0.444122,0.445496,0.446869,0.448241,
0.449611,0.450981,0.452350,0.453717,0.455084,0.456449,0.457813,0.459177,
0.460539,0.461900,0.463260,0.464619,0.465976,0.467333,0.468689,0.470043,
0.471397,0.472749,0.474100,0.475450,0.476799,0.478147,0.479494,0.480839,
0.482184,0.483527,0.484869,0.486210,0.487550,0.488889,0.490226,0.491563,
0.492898,0.494232,0.495565,0.496897,0.498228,0.499557,0.500885,0.502212,
0.503538,0.504863,0.506187,0.507509,0.508830,0.510150,0.511469,0.512786,
0.514103,0.515418,0.516732,0.518045,0.519356,0.520666,0.521975,0.523283,
0.524590,0.525895,0.527199,0.528502,0.529804,0.531104,0.532403,0.533701,
0.534998,0.536293,0.537587,0.538880,0.540171,0.541462,0.542751,0.544039,
0.545325,0.546610,0.547894,0.549177,0.550458,0.551738,0.553017,0.554294,
0.555570,0.556845,0.558119,0.559391,0.560662,0.561931,0.563199,0.564466,
0.565732,0.566996,0.568259,0.569521,0.570781,0.572040,0.573297,0.574553,
0.575808,0.577062,0.578314,0.579565,0.580814,0.582062,0.583309,0.584554,
0.585798,0.587040,0.588282,0.589521,0.590760,0.591997,0.593232,0.594466,
0.595699,0.596931,0.598161,0.599389,0.600616,0.601842,0.603067,0.604290,
0.605511,0.606731,0.607950,0.609167,0.610383,0.611597,0.612810,0.614022,
0.615232,0.616440,0.617647,0.618853,0.620057,0.621260,0.622461,0.623661,
0.624859,0.626056,0.627252,0.628446,0.629638,0.630829,0.632019,0.633207,
0.634393,0.635578,0.636762,0.637944,0.639124,0.640303,0.641481,0.642657,
0.643832,0.645005,0.646176,0.647346,0.648514,0.649681,0.650847,0.652011,
0.653173,0.654334,0.655493,0.656651,0.657807,0.658961,0.660114,0.661266,
0.662416,0.663564,0.664711,0.665856,0.667000,0.668142,0.669283,0.670422,
0.671559,0.672695,0.673829,0.674962,0.676093,0.677222,0.678350,0.679476,
0.680601,0.681724,0.682846,0.683965,0.685084,0.686200,0.687315,0.688429,
0.689541,0.690651,0.691759,0.692866,0.693971,0.695075,0.696177,0.697278,
0.698376,0.699473,0.700569,0.701663,0.702755,0.703845,0.704934,0.706021,
0.707107,0.708191,0.709273,0.710353,0.711432,0.712509,0.713585,0.714659,
0.715731,0.716801,0.717870,0.718937,0.720003,0.721066,0.722128,0.723188,
0.724247,0.725304,0.726359,0.727413,0.728464,0.729514,0.730563,0.731609,
0.732654,0.733697,0.734739,0.735779,0.736817,0.737853,0.738887,0.739920,
0.740951,0.741980,0.743008,0.744034,0.745058,0.746080,0.747101,0.748119,
0.749136,0.750152,0.751165,0.752177,0.753187,0.754195,0.755201,0.756206,
0.757209,0.758210,0.759209,0.760207,0.761202,0.762196,0.763188,0.764179,
0.765167,0.766154,0.767139,0.768122,0.769103,0.770083,0.771061,0.772036,
0.773010,0.773983,0.774953,0.775922,0.776888,0.777853,0.778817,0.779778,
0.780737,0.781695,0.782651,0.783605,0.784557,0.785507,0.786455,0.787402,
0.788346,0.789289,0.790230,0.791169,0.792107,0.793042,0.793975,0.794907,
0.795837,0.796765,0.797691,0.798615,0.799537,0.800458,0.801376,0.802293,
0.803208,0.804120,0.805031,0.805940,0.806848,0.807753,0.808656,0.809558,
0.810457,0.811355,0.812251,0.813144,0.814036,0.814926,0.815814,0.816701,
0.817585,0.818467,0.819348,0.820226,0.821103,0.821977,0.822850,0.823721,
0.824589,0.825456,0.826321,0.827184,0.828045,0.828904,0.829761,0.830616,
0.831470,0.832321,0.833170,0.834018,0.834863,0.835706,0.836548,0.837387,
0.838225,0.839060,0.839894,0.840725,0.841555,0.842383,0.843208,0.844032,
0.844854,0.845673,0.846491,0.847307,0.848120,0.848932,0.849742,0.850549,
0.851355,0.852159,0.852961,0.853760,0.854558,0.855354,0.856147,0.856939,
0.857729,0.858516,0.859302,0.860085,0.860867,0.861646,0.862424,0.863199,
0.863973,0.864744,0.865514,0.866281,0.867046,0.867809,0.868571,0.869330,
0.870087,0.870842,0.871595,0.872346,0.873095,0.873842,0.874587,0.875329,
0.876070,0.876809,0.877545,0.878280,0.879012,0.879743,0.880471,0.881197,
0.881921,0.882643,0.883363,0.884081,0.884797,0.885511,0.886223,0.886932,
0.887640,0.888345,0.889048,0.889750,0.890449,0.891146,0.891841,0.892534,
0.893224,0.893913,0.894599,0.895284,0.895966,0.896646,0.897325,0.898001,
0.898674,0.899346,0.900016,0.900683,0.901349,0.902012,0.902673,0.903332,
0.903989,0.904644,0.905297,0.905947,0.906596,0.907242,0.907886,0.908528,
0.909168,0.909806,0.910441,0.911075,0.911706,0.912335,0.912962,0.913587,
0.914210,0.914830,0.915449,0.916065,0.916679,0.917291,0.917901,0.918508,
0.919114,0.919717,0.920318,0.920917,0.921514,0.922109,0.922701,0.923291,
0.923880,0.924465,0.925049,0.925631,0.926210,0.926787,0.927363,0.927935,
0.928506,0.929075,0.929641,0.930205,0.930767,0.931327,0.931884,0.932440,
0.932993,0.933544,0.934093,0.934639,0.935184,0.935726,0.936266,0.936803,
0.937339,0.937872,0.938404,0.938932,0.939459,0.939984,0.940506,0.941026,
0.941544,0.942060,0.942573,0.943084,0.943593,0.944100,0.944605,0.945107,
0.945607,0.946105,0.946601,0.947094,0.947586,0.948075,0.948561,0.949046,
0.949528,0.950008,0.950486,0.950962,0.951435,0.951906,0.952375,0.952842,
0.953306,0.953768,0.954228,0.954686,0.955141,0.955594,0.956045,0.956494,
0.956940,0.957385,0.957826,0.958266,0.958703,0.959139,0.959572,0.960002,
0.960431,0.960857,0.961280,0.961702,0.962121,0.962538,0.962953,0.963366,
0.963776,0.964184,0.964590,0.964993,0.965394,0.965793,0.966190,0.966584,
0.966976,0.967366,0.967754,0.968139,0.968522,0.968903,0.969281,0.969657,
0.970031,0.970403,0.970772,0.971139,0.971504,0.971866,0.972226,0.972584,
0.972940,0.973293,0.973644,0.973993,0.974339,0.974684,0.975025,0.975365,
0.975702,0.976037,0.976370,0.976700,0.977028,0.977354,0.977677,0.977999,
0.978317,0.978634,0.978948,0.979260,0.979570,0.979877,0.980182,0.980485,
0.980785,0.981083,0.981379,0.981673,0.981964,0.982253,0.982539,0.982824,
0.983105,0.983385,0.983662,0.983937,0.984210,0.984480,0.984749,0.985014,
0.985278,0.985539,0.985798,0.986054,0.986308,0.986560,0.986809,0.987057,
0.987301,0.987544,0.987784,0.988022,0.988258,0.988491,0.988722,0.988950,
0.989177,0.989400,0.989622,0.989841,0.990058,0.990273,0.990485,0.990695,
0.990903,0.991108,0.991311,0.991511,0.991710,0.991906,0.992099,0.992291,
0.992480,0.992666,0.992850,0.993032,0.993212,0.993389,0.993564,0.993737,
0.993907,0.994075,0.994240,0.994404,0.994565,0.994723,0.994879,0.995033,
0.995185,0.995334,0.995481,0.995625,0.995767,0.995907,0.996045,0.996180,
0.996313,0.996443,0.996571,0.996697,0.996820,0.996941,0.997060,0.997176,
0.997290,0.997402,0.997511,0.997618,0.997723,0.997825,0.997925,0.998023,
0.998118,0.998211,0.998302,0.998390,0.998476,0.998559,0.998640,0.998719,
0.998795,0.998870,0.998941,0.999011,0.999078,0.999142,0.999205,0.999265,
0.999322,0.999378,0.999431,0.999481,0.999529,0.999575,0.999619,0.999660,
0.999699,0.999735,0.999769,0.999801,0.999831,0.999858,0.999882,0.999905,
0.999925,0.999942,0.999958,0.999971,0.999981,0.999989,0.999995,0.999999
};

double sin( double x ) {
  int index;
  int quad;

  index = 1024 * x / (M_PI * 0.5);
  quad = ( index >> 10 ) & 3;
  index &= 1023;
  switch ( quad ) {
  case 0:
    return sintable[index];
  case 1:
    return sintable[1023-index];
  case 2:
    return -sintable[index];
  case 3:
    return -sintable[1023-index];
  }
  return 0;
}


double cos( double x ) {
  int index;
  int quad;

  index = 1024 * x / (M_PI * 0.5);
  quad = ( index >> 10 ) & 3;
  index &= 1023;
  switch ( quad ) {
  case 3:
    return sintable[index];
  case 0:
    return sintable[1023-index];
  case 1:
    return -sintable[index];
  case 2:
    return -sintable[1023-index];
  }
  return 0;
}


/*
void create_acostable( void ) {
  int i;
  FILE *fp;
  float a;

  fp = fopen("c:\\acostable.txt", "w");
  fprintf(fp, "float acostable[] = {");
  for (i = 0; i < 1024; i++) {
    if (!(i & 7))
      fprintf(fp, "\n");
    a = acos( (float) -1 + i / 512 );
    fprintf(fp, "%1.8f,", a);
  }
  fprintf(fp, "\n}\n");
  fclose(fp);
}
*/


float acostable[] = {
3.14159265,3.07908248,3.05317551,3.03328655,3.01651113,3.00172442,2.98834964,2.97604422,
2.96458497,2.95381690,2.94362719,2.93393068,2.92466119,2.91576615,2.90720289,2.89893629,
2.89093699,2.88318015,2.87564455,2.86831188,2.86116621,2.85419358,2.84738169,2.84071962,
2.83419760,2.82780691,2.82153967,2.81538876,2.80934770,2.80341062,2.79757211,2.79182724,
2.78617145,2.78060056,2.77511069,2.76969824,2.76435988,2.75909250,2.75389319,2.74875926,
2.74368816,2.73867752,2.73372510,2.72882880,2.72398665,2.71919677,2.71445741,2.70976688,
2.70512362,2.70052613,2.69597298,2.69146283,2.68699438,2.68256642,2.67817778,2.67382735,
2.66951407,2.66523692,2.66099493,2.65678719,2.65261279,2.64847088,2.64436066,2.64028133,
2.63623214,2.63221238,2.62822133,2.62425835,2.62032277,2.61641398,2.61253138,2.60867440,
2.60484248,2.60103507,2.59725167,2.59349176,2.58975488,2.58604053,2.58234828,2.57867769,
2.57502832,2.57139977,2.56779164,2.56420354,2.56063509,2.55708594,2.55355572,2.55004409,
2.54655073,2.54307530,2.53961750,2.53617701,2.53275354,2.52934680,2.52595650,2.52258238,
2.51922417,2.51588159,2.51255441,2.50924238,2.50594525,2.50266278,2.49939476,2.49614096,
2.49290115,2.48967513,2.48646269,2.48326362,2.48007773,2.47690482,2.47374472,2.47059722,
2.46746215,2.46433933,2.46122860,2.45812977,2.45504269,2.45196720,2.44890314,2.44585034,
2.44280867,2.43977797,2.43675809,2.43374890,2.43075025,2.42776201,2.42478404,2.42181622,
2.41885841,2.41591048,2.41297232,2.41004380,2.40712480,2.40421521,2.40131491,2.39842379,
2.39554173,2.39266863,2.38980439,2.38694889,2.38410204,2.38126374,2.37843388,2.37561237,
2.37279910,2.36999400,2.36719697,2.36440790,2.36162673,2.35885335,2.35608768,2.35332964,
2.35057914,2.34783610,2.34510044,2.34237208,2.33965094,2.33693695,2.33423003,2.33153010,
2.32883709,2.32615093,2.32347155,2.32079888,2.31813284,2.31547337,2.31282041,2.31017388,
2.30753373,2.30489988,2.30227228,2.29965086,2.29703556,2.29442632,2.29182309,2.28922580,
2.28663439,2.28404881,2.28146900,2.27889490,2.27632647,2.27376364,2.27120637,2.26865460,
2.26610827,2.26356735,2.26103177,2.25850149,2.25597646,2.25345663,2.25094195,2.24843238,
2.24592786,2.24342836,2.24093382,2.23844420,2.23595946,2.23347956,2.23100444,2.22853408,
2.22606842,2.22360742,2.22115104,2.21869925,2.21625199,2.21380924,2.21137096,2.20893709,
2.20650761,2.20408248,2.20166166,2.19924511,2.19683280,2.19442469,2.19202074,2.18962092,
2.18722520,2.18483354,2.18244590,2.18006225,2.17768257,2.17530680,2.17293493,2.17056692,
2.16820274,2.16584236,2.16348574,2.16113285,2.15878367,2.15643816,2.15409630,2.15175805,
2.14942338,2.14709226,2.14476468,2.14244059,2.14011997,2.13780279,2.13548903,2.13317865,
2.13087163,2.12856795,2.12626757,2.12397047,2.12167662,2.11938600,2.11709859,2.11481435,
2.11253326,2.11025530,2.10798044,2.10570867,2.10343994,2.10117424,2.09891156,2.09665185,
2.09439510,2.09214129,2.08989040,2.08764239,2.08539725,2.08315496,2.08091550,2.07867884,
2.07644495,2.07421383,2.07198545,2.06975978,2.06753681,2.06531651,2.06309887,2.06088387,
2.05867147,2.05646168,2.05425445,2.05204979,2.04984765,2.04764804,2.04545092,2.04325628,
2.04106409,2.03887435,2.03668703,2.03450211,2.03231957,2.03013941,2.02796159,2.02578610,
2.02361292,2.02144204,2.01927344,2.01710710,2.01494300,2.01278113,2.01062146,2.00846399,
2.00630870,2.00415556,2.00200457,1.99985570,1.99770895,1.99556429,1.99342171,1.99128119,
1.98914271,1.98700627,1.98487185,1.98273942,1.98060898,1.97848051,1.97635399,1.97422942,
1.97210676,1.96998602,1.96786718,1.96575021,1.96363511,1.96152187,1.95941046,1.95730088,
1.95519310,1.95308712,1.95098292,1.94888050,1.94677982,1.94468089,1.94258368,1.94048818,
1.93839439,1.93630228,1.93421185,1.93212308,1.93003595,1.92795046,1.92586659,1.92378433,
1.92170367,1.91962459,1.91754708,1.91547113,1.91339673,1.91132385,1.90925250,1.90718266,
1.90511432,1.90304746,1.90098208,1.89891815,1.89685568,1.89479464,1.89273503,1.89067683,
1.88862003,1.88656463,1.88451060,1.88245794,1.88040664,1.87835668,1.87630806,1.87426076,
1.87221477,1.87017008,1.86812668,1.86608457,1.86404371,1.86200412,1.85996577,1.85792866,
1.85589277,1.85385809,1.85182462,1.84979234,1.84776125,1.84573132,1.84370256,1.84167495,
1.83964848,1.83762314,1.83559892,1.83357582,1.83155381,1.82953289,1.82751305,1.82549429,
1.82347658,1.82145993,1.81944431,1.81742973,1.81541617,1.81340362,1.81139207,1.80938151,
1.80737194,1.80536334,1.80335570,1.80134902,1.79934328,1.79733848,1.79533460,1.79333164,
1.79132959,1.78932843,1.78732817,1.78532878,1.78333027,1.78133261,1.77933581,1.77733985,
1.77534473,1.77335043,1.77135695,1.76936428,1.76737240,1.76538132,1.76339101,1.76140148,
1.75941271,1.75742470,1.75543743,1.75345090,1.75146510,1.74948002,1.74749565,1.74551198,
1.74352900,1.74154672,1.73956511,1.73758417,1.73560389,1.73362426,1.73164527,1.72966692,
1.72768920,1.72571209,1.72373560,1.72175971,1.71978441,1.71780969,1.71583556,1.71386199,
1.71188899,1.70991653,1.70794462,1.70597325,1.70400241,1.70203209,1.70006228,1.69809297,
1.69612416,1.69415584,1.69218799,1.69022062,1.68825372,1.68628727,1.68432127,1.68235571,
1.68039058,1.67842588,1.67646160,1.67449772,1.67253424,1.67057116,1.66860847,1.66664615,
1.66468420,1.66272262,1.66076139,1.65880050,1.65683996,1.65487975,1.65291986,1.65096028,
1.64900102,1.64704205,1.64508338,1.64312500,1.64116689,1.63920905,1.63725148,1.63529416,
1.63333709,1.63138026,1.62942366,1.62746728,1.62551112,1.62355517,1.62159943,1.61964388,
1.61768851,1.61573332,1.61377831,1.61182346,1.60986877,1.60791422,1.60595982,1.60400556,
1.60205142,1.60009739,1.59814349,1.59618968,1.59423597,1.59228235,1.59032882,1.58837536,
1.58642196,1.58446863,1.58251535,1.58056211,1.57860891,1.57665574,1.57470259,1.57274945,
1.57079633,1.56884320,1.56689007,1.56493692,1.56298375,1.56103055,1.55907731,1.55712403,
1.55517069,1.55321730,1.55126383,1.54931030,1.54735668,1.54540297,1.54344917,1.54149526,
1.53954124,1.53758710,1.53563283,1.53367843,1.53172389,1.52976919,1.52781434,1.52585933,
1.52390414,1.52194878,1.51999323,1.51803748,1.51608153,1.51412537,1.51216900,1.51021240,
1.50825556,1.50629849,1.50434117,1.50238360,1.50042576,1.49846765,1.49650927,1.49455060,
1.49259163,1.49063237,1.48867280,1.48671291,1.48475270,1.48279215,1.48083127,1.47887004,
1.47690845,1.47494650,1.47298419,1.47102149,1.46905841,1.46709493,1.46513106,1.46316677,
1.46120207,1.45923694,1.45727138,1.45530538,1.45333893,1.45137203,1.44940466,1.44743682,
1.44546850,1.44349969,1.44153038,1.43956057,1.43759024,1.43561940,1.43364803,1.43167612,
1.42970367,1.42773066,1.42575709,1.42378296,1.42180825,1.41983295,1.41785705,1.41588056,
1.41390346,1.41192573,1.40994738,1.40796840,1.40598877,1.40400849,1.40202755,1.40004594,
1.39806365,1.39608068,1.39409701,1.39211264,1.39012756,1.38814175,1.38615522,1.38416795,
1.38217994,1.38019117,1.37820164,1.37621134,1.37422025,1.37222837,1.37023570,1.36824222,
1.36624792,1.36425280,1.36225684,1.36026004,1.35826239,1.35626387,1.35426449,1.35226422,
1.35026307,1.34826101,1.34625805,1.34425418,1.34224937,1.34024364,1.33823695,1.33622932,
1.33422072,1.33221114,1.33020059,1.32818904,1.32617649,1.32416292,1.32214834,1.32013273,
1.31811607,1.31609837,1.31407960,1.31205976,1.31003885,1.30801684,1.30599373,1.30396951,
1.30194417,1.29991770,1.29789009,1.29586133,1.29383141,1.29180031,1.28976803,1.28773456,
1.28569989,1.28366400,1.28162688,1.27958854,1.27754894,1.27550809,1.27346597,1.27142257,
1.26937788,1.26733189,1.26528459,1.26323597,1.26118602,1.25913471,1.25708205,1.25502803,
1.25297262,1.25091583,1.24885763,1.24679802,1.24473698,1.24267450,1.24061058,1.23854519,
1.23647833,1.23440999,1.23234015,1.23026880,1.22819593,1.22612152,1.22404557,1.22196806,
1.21988898,1.21780832,1.21572606,1.21364219,1.21155670,1.20946958,1.20738080,1.20529037,
1.20319826,1.20110447,1.19900898,1.19691177,1.19481283,1.19271216,1.19060973,1.18850553,
1.18639955,1.18429178,1.18218219,1.18007079,1.17795754,1.17584244,1.17372548,1.17160663,
1.16948589,1.16736324,1.16523866,1.16311215,1.16098368,1.15885323,1.15672081,1.15458638,
1.15244994,1.15031147,1.14817095,1.14602836,1.14388370,1.14173695,1.13958808,1.13743709,
1.13528396,1.13312866,1.13097119,1.12881153,1.12664966,1.12448556,1.12231921,1.12015061,
1.11797973,1.11580656,1.11363107,1.11145325,1.10927308,1.10709055,1.10490563,1.10271831,
1.10052856,1.09833638,1.09614174,1.09394462,1.09174500,1.08954287,1.08733820,1.08513098,
1.08292118,1.08070879,1.07849378,1.07627614,1.07405585,1.07183287,1.06960721,1.06737882,
1.06514770,1.06291382,1.06067715,1.05843769,1.05619540,1.05395026,1.05170226,1.04945136,
1.04719755,1.04494080,1.04268110,1.04041841,1.03815271,1.03588399,1.03361221,1.03133735,
1.02905939,1.02677830,1.02449407,1.02220665,1.01991603,1.01762219,1.01532509,1.01302471,
1.01072102,1.00841400,1.00610363,1.00378986,1.00147268,0.99915206,0.99682798,0.99450039,
0.99216928,0.98983461,0.98749636,0.98515449,0.98280898,0.98045980,0.97810691,0.97575030,
0.97338991,0.97102573,0.96865772,0.96628585,0.96391009,0.96153040,0.95914675,0.95675912,
0.95436745,0.95197173,0.94957191,0.94716796,0.94475985,0.94234754,0.93993099,0.93751017,
0.93508504,0.93265556,0.93022170,0.92778341,0.92534066,0.92289341,0.92044161,0.91798524,
0.91552424,0.91305858,0.91058821,0.90811309,0.90563319,0.90314845,0.90065884,0.89816430,
0.89566479,0.89316028,0.89065070,0.88813602,0.88561619,0.88309116,0.88056088,0.87802531,
0.87548438,0.87293806,0.87038629,0.86782901,0.86526619,0.86269775,0.86012366,0.85754385,
0.85495827,0.85236686,0.84976956,0.84716633,0.84455709,0.84194179,0.83932037,0.83669277,
0.83405893,0.83141877,0.82877225,0.82611928,0.82345981,0.82079378,0.81812110,0.81544172,
0.81275556,0.81006255,0.80736262,0.80465570,0.80194171,0.79922057,0.79649221,0.79375655,
0.79101352,0.78826302,0.78550497,0.78273931,0.77996593,0.77718475,0.77439569,0.77159865,
0.76879355,0.76598029,0.76315878,0.76032891,0.75749061,0.75464376,0.75178826,0.74892402,
0.74605092,0.74316887,0.74027775,0.73737744,0.73446785,0.73154885,0.72862033,0.72568217,
0.72273425,0.71977644,0.71680861,0.71383064,0.71084240,0.70784376,0.70483456,0.70181469,
0.69878398,0.69574231,0.69268952,0.68962545,0.68654996,0.68346288,0.68036406,0.67725332,
0.67413051,0.67099544,0.66784794,0.66468783,0.66151492,0.65832903,0.65512997,0.65191753,
0.64869151,0.64545170,0.64219789,0.63892987,0.63564741,0.63235028,0.62903824,0.62571106,
0.62236849,0.61901027,0.61563615,0.61224585,0.60883911,0.60541564,0.60197515,0.59851735,
0.59504192,0.59154856,0.58803694,0.58450672,0.58095756,0.57738911,0.57380101,0.57019288,
0.56656433,0.56291496,0.55924437,0.55555212,0.55183778,0.54810089,0.54434099,0.54055758,
0.53675018,0.53291825,0.52906127,0.52517867,0.52126988,0.51733431,0.51337132,0.50938028,
0.50536051,0.50131132,0.49723200,0.49312177,0.48897987,0.48480547,0.48059772,0.47635573,
0.47207859,0.46776530,0.46341487,0.45902623,0.45459827,0.45012983,0.44561967,0.44106652,
0.43646903,0.43182577,0.42713525,0.42239588,0.41760600,0.41276385,0.40786755,0.40291513,
0.39790449,0.39283339,0.38769946,0.38250016,0.37723277,0.37189441,0.36648196,0.36099209,
0.35542120,0.34976542,0.34402054,0.33818204,0.33224495,0.32620390,0.32005298,0.31378574,
0.30739505,0.30087304,0.29421096,0.28739907,0.28042645,0.27328078,0.26594810,0.25841250,
0.25065566,0.24265636,0.23438976,0.22582651,0.21693146,0.20766198,0.19796546,0.18777575,
0.17700769,0.16554844,0.15324301,0.13986823,0.12508152,0.10830610,0.08841715,0.06251018,
};

double acos( double x ) {
  int index;

  if (x < -1)
    x = -1;
  if (x > 1)
    x = 1;
  index = (float) (1.0 + x) * 511.9;
  return acostable[index];
}


double atan2( double y, double x ) {
  float base;
  float temp;
  float dir;
  float test;
  int   i;

  if ( x < 0 ) {
    if ( y >= 0 ) {
      // quad 1
      base = M_PI / 2;
      temp = x;
      x = y;
      y = -temp;
    } else {
      // quad 2
      base = M_PI;
      x = -x;
      y = -y;
    }
  } else {
    if ( y < 0 ) {
      // quad 3
      base = 3 * M_PI / 2;
      temp = x;
      x = -y;
      y = temp;
    }
  }

  if ( y > x ) {
    base += M_PI/2;
    temp = x;
    x = y;
    y = temp;
    dir = -1;
  } else {
    dir = 1;
  }

  // calcualte angle in octant 0
  if ( x == 0 ) {
    return base;
  }
  y /= x;

  for ( i = 0 ; i < 512 ; i++ ) {
    test = sintable[i] / sintable[1023-i];
    if ( test > y ) {
      break;
    }
  }

  return base + dir * i * ( M_PI/2048);
}


#endif

#ifdef Q3_VM
/*
===============
rint
===============
*/
double rint( double v )
{
  if( v >= 0.5f )
    return ceil( v );
  else
    return floor( v );
}

// bk001127 - guarded this tan replacement
// ld: undefined versioned symbol name tan@@GLIBC_2.0
double tan( double x )
{
  return sin( x ) / cos( x );
}

/*
 * ====================================================
 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
 *
 * Developed at SunPro, a Sun Microsystems, Inc. business.
 * Permission to use, copy, modify, and distribute this
 * software is freely granted, provided that this notice
 * is preserved.
 * ====================================================
 */

typedef union
{
  float value;
  unsigned int word;
} ieee_float_shape_type;

/* Get a 32 bit int from a float.  */

#define GET_FLOAT_WORD(i,d)   \
do {                          \
  ieee_float_shape_type gf_u; \
  gf_u.value = (d);           \
  (i) = gf_u.word;            \
} while (0)

/* Set a float from a 32 bit int.  */

#define SET_FLOAT_WORD(d,i)   \
do {                          \
  ieee_float_shape_type sf_u; \
  sf_u.word = (i);            \
  (d) = sf_u.value;           \
} while (0)

/* A union which permits us to convert between a float and a 32 bit
   int.  */

//acos
static const float
pi      =  3.1415925026e+00, /* 0x40490fda */
pio2_hi =  1.5707962513e+00, /* 0x3fc90fda */
pio2_lo =  7.5497894159e-08, /* 0x33a22168 */
pS0     =  1.6666667163e-01, /* 0x3e2aaaab */
pS1     = -3.2556581497e-01, /* 0xbea6b090 */
pS2     =  2.0121252537e-01, /* 0x3e4e0aa8 */
pS3     = -4.0055535734e-02, /* 0xbd241146 */
pS4     =  7.9153501429e-04, /* 0x3a4f7f04 */
pS5     =  3.4793309169e-05, /* 0x3811ef08 */
qS1     = -2.4033949375e+00, /* 0xc019d139 */
qS2     =  2.0209457874e+00, /* 0x4001572d */
qS3     = -6.8828397989e-01, /* 0xbf303361 */
qS4     =  7.7038154006e-02; /* 0x3d9dc62e */

/*
==================
acos
==================
*/
double acos( double x )
{
  float z, subp, p, q, r, w, s, c, df;
  int hx, ix;

  GET_FLOAT_WORD( hx, x );
  ix = hx & 0x7fffffff;

  if( ix == 0x3f800000 )
  {   // |x|==1
    if( hx > 0 )
      return 0.0; // acos(1) = 0
    else
      return pi + (float)2.0 * pio2_lo; // acos(-1)= pi
  }
  else if( ix > 0x3f800000 )
  { // |x| >= 1
    return (x-x)/(x-x);   // acos(|x|>1) is NaN
  }

  if( ix < 0x3f000000 )
  { // |x| < 0.5
    if( ix <= 0x23000000 )
      return pio2_hi + pio2_lo;//if|x|<2**-57

    z = x * x;
    subp = pS3 + z * ( pS4 + z * pS5 );
    // chop up expression to keep mac register based stack happy
    p = z * ( pS0 + z * ( pS1 + z * ( pS2 + z * subp ) ) );
    q = 1.0 + z * ( qS1 + z * ( qS2 + z * ( qS3 + z * qS4 ) ) );
    r = p / q;
    return pio2_hi - ( x - ( pio2_lo - x * r ) );
  }
  else if( hx < 0 )
  {   // x < -0.5
    z = ( 1.0 + x ) * (float)0.5;
    subp = pS3 + z * ( pS4 + z * pS5 );
    // chop up expression to keep mac register based stack happy
    p = z * ( pS0 + z * ( pS1 + z * ( pS2 + z * subp ) ) );
    q = 1.0 + z * ( qS1 + z * ( qS2 + z * ( qS3 + z * qS4 ) ) );
    s = sqrt( z );
    r = p / q;
    w = r * s - pio2_lo;
    return pi - (float)2.0 * ( s + w );
  }
  else
  {     // x > 0.5
    int idf;
    z = ( 1.0 - x ) * (float)0.5;
    s = sqrt( z );
    df = s;
    GET_FLOAT_WORD( idf, df );
    SET_FLOAT_WORD( df, idf & 0xfffff000 );
    c  = ( z - df * df ) / ( s + df );
    subp = pS3 + z * ( pS4 + z * pS5 );
    // chop up expression to keep mac register based stack happy
    p = z * ( pS0 + z * ( pS1 + z * ( pS2 + z * subp ) ) );
    q = 1.0 + z * ( qS1 + z * ( qS2 + z * ( qS3 + z * qS4 ) ) );
    r = p / q;
    w = r * s + c;
    return (double)( 2.0 * ( df + w ) );
  }
}

//pow
static const float
bp[ ]   = { 1.0, 1.5, },
dp_h[ ] = { 0.0, 5.84960938e-01, }, /* 0x3f15c000 */
dp_l[ ] = { 0.0, 1.56322085e-06, }, /* 0x35d1cfdc */
huge    =  1.0e+30,
tiny    =  1.0e-30,
zero    =  0.0,
one     =  1.0,
two     =  2.0,
two24   =  16777216.0,  /* 0x4b800000 */
two25   =  3.355443200e+07, /* 0x4c000000 */
twom25  =  2.9802322388e-08,  /* 0x33000000 */
  /* poly coefs for (3/2)*(log(x)-2s-2/3*s**3 */
L1      =  6.0000002384e-01, /* 0x3f19999a */
L2      =  4.2857143283e-01, /* 0x3edb6db7 */
L3      =  3.3333334327e-01, /* 0x3eaaaaab */
L4      =  2.7272811532e-01, /* 0x3e8ba305 */
L5      =  2.3066075146e-01, /* 0x3e6c3255 */
L6      =  2.0697501302e-01, /* 0x3e53f142 */
P1      =  1.6666667163e-01, /* 0x3e2aaaab */
P2      = -2.7777778450e-03, /* 0xbb360b61 */
P3      =  6.6137559770e-05, /* 0x388ab355 */
P4      = -1.6533901999e-06, /* 0xb5ddea0e */
P5      =  4.1381369442e-08, /* 0x3331bb4c */
lg2     =  6.9314718246e-01, /* 0x3f317218 */
lg2_h   =  6.93145752e-01, /* 0x3f317200 */
lg2_l   =  1.42860654e-06, /* 0x35bfbe8c */
ovt     =  4.2995665694e-08, /* -(128-log2(ovfl+.5ulp)) */
cp      =  9.6179670095e-01, /* 0x3f76384f =2/(3ln2) */
cp_h    =  9.6179199219e-01, /* 0x3f763800 =head of cp */
cp_l    =  4.7017383622e-06, /* 0x369dc3a0 =tail of cp_h */
ivln2   =  1.4426950216e+00, /* 0x3fb8aa3b =1/ln2 */
ivln2_h =  1.4426879883e+00, /* 0x3fb8aa00 =16b 1/ln2*/
ivln2_l =  7.0526075433e-06; /* 0x36eca570 =1/ln2 tail*/

/*
==================
copysignf
==================
*/
static float copysignf( float x, float y )
{
  unsigned int ix, iy;

  GET_FLOAT_WORD( ix, x );
  GET_FLOAT_WORD( iy, y );
  SET_FLOAT_WORD( x, ( ix & 0x7fffffff ) | ( iy & 0x80000000 ) );
  return x;
}

/*
==================
__scalbnf
==================
*/
static float __scalbnf( float x, int n )
{
  int k, ix;

  GET_FLOAT_WORD( ix, x );

  k = ( ix & 0x7f800000 ) >> 23;    /* extract exponent */

  if( k == 0 )
  {       /* 0 or subnormal x */
    if( ( ix & 0x7fffffff ) == 0 )
      return x; /* +-0 */

    x *= two25;
    GET_FLOAT_WORD( ix, x );
    k = ( ( ix & 0x7f800000 ) >> 23 ) - 25;
  }
  if( k == 0xff )
    return x+x;    /* NaN or Inf */

  k = k + n;

  if( n > 50000 || k > 0xfe )
    return huge * copysignf( huge, x ); /* overflow  */
  if ( n < -50000 )
    return tiny * copysignf( tiny, x );  /*underflow*/
  if( k > 0 )        /* normal result */
  {
    SET_FLOAT_WORD( x, ( ix & 0x807fffff ) | ( k << 23 ) );
    return x;
  }
  if( k <= -25 )
    return tiny * copysignf( tiny, x );  /*underflow*/

  k += 25;        /* subnormal result */
  SET_FLOAT_WORD( x, ( ix & 0x807fffff ) | ( k << 23 ) );
  return x * twom25;
}

/*
==================
pow
==================
*/
float pow( float x, float y )
{
  float z, ax, z_h, z_l, p_h, p_l;
  float y1, subt1, t1, t2, subr, r, s, t, u, v, w;
  int i, j, k, yisint, n;
  int hx, hy, ix, iy, is;

  /*TA: for some reason the Q3 VM goes apeshit when x = 1.0
        and y > 1.0. Curiously this doesn't happen with gcc
        hence this hack*/
  if( x == 1.0 )
    return x;

  GET_FLOAT_WORD( hx, x );
  GET_FLOAT_WORD( hy, y );
  ix = hx & 0x7fffffff;
  iy = hy & 0x7fffffff;

  /* y==zero: x**0 = 1 */
  if( iy == 0 )
    return one;

  /* +-NaN return x+y */
  if( ix > 0x7f800000 || iy > 0x7f800000 )
    return x + y;

  /* determine if y is an odd int when x < 0
   * yisint = 0 ... y is not an integer
   * yisint = 1 ... y is an odd int
   * yisint = 2 ... y is an even int
   */
  yisint = 0;
  if( hx < 0 )
  {
    if( iy >= 0x4b800000 )
      yisint = 2; /* even integer y */
    else if( iy >= 0x3f800000 )
    {
      k = ( iy >> 23 ) - 0x7f;     /* exponent */
      j = iy >> ( 23 - k );
      if( ( j << ( 23 - k ) ) == iy )
        yisint = 2 - ( j & 1 );
    }
  }

  /* special value of y */
  if( iy == 0x7f800000 )
  { /* y is +-inf */
    if( ix == 0x3f800000 )
      return  y - y;  /* inf**+-1 is NaN */
    else if( ix > 0x3f800000 )/* (|x|>1)**+-inf = inf,0 */
      return ( hy >= 0 ) ? y : zero;
    else      /* (|x|<1)**-,+inf = inf,0 */
      return ( hy < 0 ) ? -y : zero;
  }

  if( iy == 0x3f800000 )
  {  /* y is  +-1 */
    if( hy < 0 )
      return one / x;
    else
      return x;
  }

  if( hy == 0x40000000 )
    return x * x; /* y is  2 */

  if( hy == 0x3f000000 )
  {  /* y is  0.5 */
    if( hx >= 0 ) /* x >= +0 */
      return sqrt( x );
  }

  ax = fabs( x );

  /* special value of x */
  if( ix == 0x7f800000 || ix == 0 || ix == 0x3f800000 )
  {
    z = ax;     /*x is +-0,+-inf,+-1*/
    if( hy < 0 )
      z = one / z; /* z = (1/|x|) */
    if( hx < 0 )
    {
      if( ( ( ix - 0x3f800000 ) | yisint ) == 0 )
        z = ( z - z ) / ( z - z ); /* (-1)**non-int is NaN */
      else if( yisint == 1 )
        z = -z;   /* (x<0)**odd = -(|x|**odd) */
    }

    return z;
  }

  /* (x<0)**(non-int) is NaN */
  if( ( ( ( (unsigned int)hx >> 31 ) - 1 ) | yisint ) == 0 )
    return ( x - x ) / ( x - x );

  /* |y| is huge */
  if( iy > 0x4d000000 )
  { /* if |y| > 2**27 */
    /* over/underflow if x is not close to one */
    if( ix < 0x3f7ffff8 )
      return ( hy < 0 ) ? huge * huge : tiny * tiny;

    if( ix > 0x3f800007 )
      return ( hy > 0 ) ? huge * huge : tiny * tiny;
  /* now |1-x| is tiny <= 2**-20, suffice to compute
     log(x) by x-x^2/2+x^3/3-x^4/4 */
    t = x - 1;    /* t has 20 trailing zeros */
    w = ( t * t ) * ( (float)0.5 - t * ( (float)0.333333333333 - t * (float)0.25 ) );
    u = ivln2_h * t;  /* ivln2_h has 16 sig. bits */
    v = t * ivln2_l - w * ivln2;
    t1 = u + v;
    GET_FLOAT_WORD( is, t1 );
    SET_FLOAT_WORD( t1, is & 0xfffff000 );
    t2 = v - ( t1 - u );
  }
  else
  {
    float s2, s_h, s_l, t_h, t_l;
    n = 0;
    /* take care subnormal number */
    if( ix < 0x00800000 )
    {
      ax *= two24;
      n -= 24;
      GET_FLOAT_WORD( ix, ax );
    }

    n  += ( ( ix ) >> 23 ) - 0x7f;
    j  = ix & 0x007fffff;

    /* determine interval */
    ix = j | 0x3f800000;    /* normalize ix */
    if( j <= 0x1cc471 )
      k = 0;  /* |x|<sqrt(3/2) */
    else if( j < 0x5db3d7 )
      k = 1;  /* |x|<sqrt(3)   */
    else
    {
      k = 0;
      n += 1;
      ix -= 0x00800000;
    }
    SET_FLOAT_WORD( ax, ix );

    /* compute s = s_h+s_l = (x-1)/(x+1) or (x-1.5)/(x+1.5) */
    u = ax - bp[ k ];   /* bp[0]=1.0, bp[1]=1.5 */
    v = one / ( ax + bp[ k ] );
    s = u * v;
    s_h = s;
    GET_FLOAT_WORD( is, s_h );
    SET_FLOAT_WORD( s_h, is & 0xfffff000 );
    /* t_h=ax+bp[k] High */
    SET_FLOAT_WORD( t_h, ( ( ix >> 1 ) | 0x20000000 ) + 0x0040000 + ( k << 21 ) );
    t_l = ax - ( t_h - bp[ k ] );
    s_l = v * ( ( u - s_h * t_h ) - s_h * t_l );
    /* compute log(ax) */
    s2 = s * s;
    subr = L3 + s2 * ( L4 + s2 * ( L5 + s2 * L6 ) );
    // chop up expression to keep mac register based stack happy
    r = s2 * s2 * ( L1 + s2 * ( L2 + s2 * subr ) );
    r += s_l * ( s_h + s );
    s2  = s_h * s_h;
    t_h = (float)3.0 + s2 + r;
    GET_FLOAT_WORD( is, t_h );
    SET_FLOAT_WORD( t_h, is & 0xfffff000 );
    t_l = r - ( ( t_h - (float)3.0 ) - s2 );
    /* u+v = s*(1+...) */
    u = s_h * t_h;
    v = s_l * t_h + t_l * s;
    /* 2/(3log2)*(s+...) */
    p_h = u + v;
    GET_FLOAT_WORD( is, p_h );
    SET_FLOAT_WORD( p_h, is & 0xfffff000 );
    p_l = v - ( p_h - u );
    z_h = cp_h * p_h;   /* cp_h+cp_l = 2/(3*log2) */
    z_l = cp_l * p_h + p_l * cp + dp_l[ k ];
    /* log2(ax) = (s+..)*2/(3*log2) = n + dp_h + z_h + z_l */
    t = (float)n;
    t1 = ( ( ( z_h + z_l ) + dp_h[ k ] ) + t );
    GET_FLOAT_WORD( is, t1 );
    SET_FLOAT_WORD( t1, is & 0xfffff000 );
    t2 = z_l - ( ( ( t1 - t ) - dp_h[ k ] ) - z_h );
  }

  s = one; /* s (sign of result -ve**odd) = -1 else = 1 */
  if( ( ( ( (unsigned int)hx >> 31 ) - 1 ) | ( yisint - 1 ) ) == 0 )
    s = -one; /* (-ve)**(odd int) */

  /* split up y into y1+y2 and compute (y1+y2)*(t1+t2) */
  GET_FLOAT_WORD( is, y );
  SET_FLOAT_WORD( y1, is & 0xfffff000 );
  p_l = ( y - y1 ) * t1 + y * t2;
  p_h = y1 * t1;
  z = p_l + p_h;
  GET_FLOAT_WORD( j, z );

  if( j > 0x43000000 )       /* if z > 128 */
    return s * huge * huge;       /* overflow */
  else if( j == 0x43000000 )
  {     /* if z == 128 */
    if( p_l + ovt > z - p_h )
      return s * huge * huge; /* overflow */
  }
  else if( ( j & 0x7fffffff ) > 0x43160000 )   /* z <= -150 */
    return s * tiny * tiny;       /* underflow */
  else if( (unsigned int)j == 0xc3160000 )
  { /* z == -150 */
    if( p_l <= z - p_h )
      return s * tiny * tiny;    /* underflow */
  }

  /*
   * compute 2**(p_h+p_l)
   */
  i = j & 0x7fffffff;
  k = ( i >> 23 ) - 0x7f;
  n = 0;

  if( i > 0x3f000000 )
  {    /* if |z| > 0.5, set n = [z+0.5] */
    n = j + ( 0x00800000 >> ( k + 1 ) );
    k = ( ( n & 0x7fffffff ) >> 23 ) - 0x7f;  /* new k for n */
    SET_FLOAT_WORD( t, n & ~( 0x007fffff >> k ) );
    n = ( ( n & 0x007fffff ) | 0x00800000 ) >> ( 23 - k );

    if( j < 0 )
      n = -n;

    p_h -= t;
  }

  t = p_l + p_h;
  GET_FLOAT_WORD( is, t );
  SET_FLOAT_WORD( t, is & 0xfffff000 );
  u = t * lg2_h;
  v = ( p_l - ( t - p_h ) ) * lg2 + t * lg2_l;
  z = u + v;
  w = v - ( z - u );
  t = z * z;
  subt1 = P3 + t * ( P4 + t * P5 );
  // chop up expression to keep mac register based stack happy
  t1 = z - t * ( P1 + t * ( P2 + t * subt1 ) );
  r = ( z * t1 ) / ( t1 - two ) - ( w + z * w );
  z = one - ( r - z );
  GET_FLOAT_WORD( j, z );
  j += (n << 23 );

  if( ( j >> 23 ) <= 0 )
    z = __scalbnf( z, n );  /* subnormal output */
  else
    SET_FLOAT_WORD( z, j );

  return s * z;
}

#endif



static int randSeed = 0;

void srand( unsigned seed )
{
  randSeed = seed;
}

int rand( void )
{
  randSeed = ( 69069 * randSeed + 1 );
  return randSeed & 0x7fff;
}

double atof( const char *string )
{
  float sign;
  float value;
  int   c;

  // skip whitespace
  while( *string <= ' ' )
  {
    if( !*string )
      return 0;

    string++;
  }

  // check sign
  switch( *string )
  {
    case '+':
      string++;
      sign = 1;
      break;

    case '-':
      string++;
      sign = -1;
      break;

    default:
      sign = 1;
      break;
  }

  // read digits
  value = 0;
  c = string[ 0 ];

  if( c != '.' )
  {
    do
    {
      c = *string++;
      if( c < '0' || c > '9' )
        break;

      c -= '0';
      value = value * 10 + c;
    } while( 1 );
  }
  else
    string++;

  // check for decimal point
  if( c == '.' )
  {
    double fraction;

    fraction = 0.1;
    do
    {
      c = *string++;
      if( c < '0' || c > '9' )
        break;

      c -= '0';
      value += c * fraction;
      fraction *= 0.1;
    } while( 1 );

  }

  // not handling 10e10 notation...

  return value * sign;
}

double _atof( const char **stringPtr )
{
  const char  *string;
  float sign;
  float value;
  int   c = '0'; // bk001211 - uninitialized use possible

  string = *stringPtr;

  // skip whitespace
  while( *string <= ' ' )
  {
    if( !*string )
    {
      *stringPtr = string;
      return 0;
    }

    string++;
  }

  // check sign
  switch( *string )
  {
    case '+':
      string++;
      sign = 1;
      break;

    case '-':
      string++;
      sign = -1;
      break;

    default:
      sign = 1;
      break;
  }

  // read digits
  value = 0;
  if( string[ 0 ] != '.' )
  {
    do
    {
      c = *string++;
      if( c < '0' || c > '9' )
        break;

      c -= '0';
      value = value * 10 + c;
    } while( 1 );
  }

  // check for decimal point
  if( c == '.' )
  {
    double fraction;

    fraction = 0.1;
    do
    {
      c = *string++;
      if( c < '0' || c > '9' )
        break;

      c -= '0';
      value += c * fraction;
      fraction *= 0.1;
    } while( 1 );

  }

  // not handling 10e10 notation...
  *stringPtr = string;

  return value * sign;
}


#if defined ( Q3_VM )

int atoi( const char *string )
{
  int   sign;
  int   value;
  int   c;

  // skip whitespace
  while( *string <= ' ' )
  {
    if( !*string )
      return 0;

    string++;
  }

  // check sign
  switch( *string )
  {
    case '+':
      string++;
      sign = 1;
      break;

    case '-':
      string++;
      sign = -1;
      break;

    default:
      sign = 1;
      break;
  }

  // read digits
  value = 0;
  do
  {
    c = *string++;
    if( c < '0' || c > '9' )
      break;

    c -= '0';
    value = value * 10 + c;
  } while( 1 );

  // not handling 10e10 notation...

  return value * sign;
}


int _atoi( const char **stringPtr )
{
  int   sign;
  int   value;
  int   c;
  const char  *string;

  string = *stringPtr;

  // skip whitespace
  while( *string <= ' ' )
  {
    if( !*string )
      return 0;

    string++;
  }

  // check sign
  switch( *string )
  {
    case '+':
      string++;
      sign = 1;
      break;

    case '-':
      string++;
      sign = -1;
      break;

    default:
      sign = 1;
      break;
  }

  // read digits
  value = 0;
  do
  {
    c = *string++;
    if( c < '0' || c > '9' )
      break;

    c -= '0';
    value = value * 10 + c;
  } while( 1 );

  // not handling 10e10 notation...

  *stringPtr = string;

  return value * sign;
}

int abs( int n )
{
  return n < 0 ? -n : n;
}

double fabs( double x )
{
  return x < 0 ? -x : x;
}

unsigned int _hextoi( const char **stringPtr )
{
  unsigned int value;
  int          c;
  int          i;
  const char   *string;
 
  string = *stringPtr;
 
  // skip whitespace
  while( *string <= ' ' )
  {
    if( !*string )
      return 0;

    string++;
  }

  value = 0;
  i = 0;
  while( i++ < 8 && ( c = *string++ ) )
  {
    if ( c >= '0' && c <= '9' )
    {
      value = value * 16 + c - '0';
      continue;
    }
    else if ( c >= 'a' && c <= 'f' )
    {
      value = value * 16 + 10 + c - 'a';
      continue;
    }
    else if ( c >= 'A' && c <= 'F' )
    {
      value = value * 16 + 10 + c - 'A';
      continue;
    }
    else
      break;
  }
  *stringPtr = string;
  return value;
}

//=========================================================


#define ALT       0x00000001    /* alternate form */
#define HEX       0x00000002    /* hexadecimal  */
#define LADJUST   0x00000004    /* left adjustment */
#define LONGDBL   0x00000008    /* long double */
#define LONGINT   0x00000010    /* long integer */
#define QUADINT   0x00000020    /* quad integer */
#define SHORTINT  0x00000040    /* short integer */
#define ZEROPAD   0x00000080    /* zero (as opposed to blank) pad */
#define FPT       0x00000100    /* floating point number */

#define to_digit(c)   ((c) - '0')
#define is_digit(c)   ((unsigned)to_digit(c) <= 9)
#define to_char(n)    ((n) + '0')

void AddInt( char **buf_p, int val, int width, int flags )
{
  char  text[ 32 ];
  int   digits;
  char  *buf;

  digits = 0;

  if( flags & HEX )
  {
    char c;
    int n = 0;

    while( n < 32 )
    {
      c = "0123456789abcdef"[ ( val >> n ) & 0xF ];
      n += 4;
      if( c == '0' && !digits )
        continue;    
      text[ digits++ ] = c;
    }
    text[ digits ] = '\0';
  }
  else
  {
    int   signedVal = val;

    if( val < 0 )
      val = -val;
    do
    {
      text[ digits++ ] = '0' + val % 10;
      val /= 10;
    } while( val );

    if( signedVal < 0 )
      text[ digits++ ] = '-';
  }

  buf = *buf_p;

  if( !( flags & LADJUST ) )
  {
    while( digits < width )
    {
      *buf++ = ( flags & ZEROPAD ) ? '0' : ' ';
      width--;
    }
  }

  while( digits-- )
  {
    *buf++ = text[ digits ];
    width--;
  }

  if( flags & LADJUST )
  {
    while( width-- > 0 )
      *buf++ = ( flags & ZEROPAD ) ? '0' : ' ';
  }

  *buf_p = buf;
}

void AddFloat( char **buf_p, float fval, int width, int prec )
{
  char  text[ 32 ];
  int   digits;
  float signedVal;
  char  *buf;
  int   val;

  // get the sign
  signedVal = fval;
  if( fval < 0 )
    fval = -fval;

  // write the float number
  digits = 0;
  val = (int)fval;

  do
  {
    text[ digits++ ] = '0' + val % 10;
    val /= 10;
  } while( val );

  if( signedVal < 0 )
    text[digits++] = '-';

  buf = *buf_p;

  while( digits < width )
    *buf++ = ' ';
    width--;

  while( digits-- )
    *buf++ = text[ digits ];

  *buf_p = buf;

  if( prec < 0 )
    prec = 6;

  // write the fraction
  digits = 0;

  while( digits < prec )
  {
    fval -= (int)fval;
    fval *= 10.0;
    val = (int)fval;
    text[ digits++ ] = '0' + val % 10;
  }

  if( digits > 0 )
  {
    buf = *buf_p;
    *buf++ = '.';
    for( prec = 0; prec < digits; prec++ )
      *buf++ = text[ prec ];

    *buf_p = buf;
  }
}

void AddVec3_t( char **buf_p, vec3_t v, int width, int prec )
{
  char *buf;

  buf = *buf_p;

  *buf++ = '[';

  AddFloat( &buf, v[ 0 ], width, prec );
  buf += width;
  *buf++ = ' ';

  AddFloat( &buf, v[ 1 ], width, prec );
  buf += width;
  *buf++ = ' ';

  AddFloat( &buf, v[ 2 ], width, prec );
  buf += width;
  *buf++ = ']';

  *buf_p = buf;
}

void AddString( char **buf_p, char *string, int width, int prec )
{
  int   size;
  char  *buf;

  buf = *buf_p;

  if( string == NULL )
  {
    string = "(null)";
    prec = -1;
  }

  if( prec >= 0 )
  {
    for( size = 0; size < prec; size++ )
    {
      if( string[ size ] == '\0' )
        break;
    }
  }
  else
    size = strlen( string );

  width -= size;

  while( size-- )
    *buf++ = *string++;

  while( width-- > 0 )
    *buf++ = ' ';

  *buf_p = buf;
}

/*
vsprintf

I'm not going to support a bunch of the more arcane stuff in here
just to keep it simpler.  For example, the '*' and '$' are not
currently supported.  I've tried to make it so that it will just
parse and ignore formats we don't support.
*/
int vsprintf( char *buffer, const char *fmt, va_list argptr )
{
  int   *arg;
  char  *buf_p;
  char  ch;
  int   flags;
  int   width;
  int   prec;
  int   n;
  char  sign;

  buf_p = buffer;
  arg = (int *)argptr;

  while( qtrue )
  {
    // run through the format string until we hit a '%' or '\0'
    for( ch = *fmt; ( ch = *fmt ) != '\0' && ch != '%'; fmt++ )
      *buf_p++ = ch;

    if( ch == '\0' )
      goto done;

    // skip over the '%'
    fmt++;

    // reset formatting state
    flags = 0;
    width = 0;
    prec = -1;
    sign = '\0';

rflag:
    ch = *fmt++;
reswitch:
    switch( ch )
    {
      case '-':
        flags |= LADJUST;
        goto rflag;

      case '.':
        n = 0;
        while( is_digit( ( ch = *fmt++ ) ) )
          n = 10 * n + ( ch - '0' );

        prec = n < 0 ? -1 : n;
        goto reswitch;

      case '0':
        flags |= ZEROPAD;
        goto rflag;

      case '1':
      case '2':
      case '3':
      case '4':
      case '5':
      case '6':
      case '7':
      case '8':
      case '9':
        n = 0;
        do
        {
          n = 10 * n + ( ch - '0' );
          ch = *fmt++;
        } while( is_digit( ch ) );

        width = n;
        goto reswitch;

      case 'c':
        *buf_p++ = (char)*arg;
        arg++;
        break;

      case 'd':
      case 'i':
        AddInt( &buf_p, *arg, width, flags );
        arg++;
        break;

      case 'f':
        AddFloat( &buf_p, *(double *)arg, width, prec );
#ifdef Q3_VM
        arg += 1; // everything is 32 bit in my compiler
#else
        arg += 2;
#endif
        break;

      case 's':
        AddString( &buf_p, (char *)*arg, width, prec );
        arg++;
        break;

      case 'v':
        AddVec3_t( &buf_p, (vec_t *)*arg, width, prec );
        arg++;
        break;
      
      case 'x':
        flags |= HEX;
        AddInt( &buf_p, *arg, width, prec );
        arg++;
        break;

      case '%':
        *buf_p++ = ch;
        break;

      default:
        *buf_p++ = (char)*arg;
        arg++;
        break;
    }
  }

done:
  *buf_p = 0;
  return buf_p - buffer;
}


/* this is really crappy */
int sscanf( const char *buffer, const char *fmt, ... )
{
  int cmd;
  int **arg;
  int count;

  arg = (int **)&fmt + 1;
  count = 0;

  while( *fmt )
  {
    if( fmt[ 0 ] != '%' )
    {
      fmt++;
      continue;
    }

    cmd = fmt[ 1 ];
    fmt += 2;

    switch( cmd )
    {
      case 'i':
      case 'd':
      case 'u':
        **arg = _atoi( &buffer );
        break;
      case 'f':
        *(float *)*arg = _atof( &buffer );
        break;
      case 'x':
        **arg = _hextoi( &buffer );
        break;
    }

    arg++;
  }

  return count;
}

#endif
